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Photon is electromagnetic field, right? 
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#37
Dec1212, 10:44 AM

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#38
Dec1212, 10:45 AM

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http://en.wikipedia.org/wiki/Maxwell...ectromagnetism : any phenomenon involving individual photons, such as... would be difficult or impossible to explain if Maxwell's equations were exactly true, as Maxwell's equations do not involve photons. Electromagnetic wave equation is only DERIVED from them, and it is not to describe any properties of photons, but only to get to the speed of light. It also has nothing to do whether photons are neutrally charger or not, it is about working out that equation in a setup of vacuum and chargefree SPACE. 


#39
Dec1212, 10:50 AM

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#40
Dec1212, 10:59 AM

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You're mixing classical and quantum ideas. Classical and quantum electrodynamics are two completely different frameworks. For the majority of this thread we've been discussing light in terms of classical EM waves. Now you're claiming I'm wrong because you suddenly decided to switch over to quantum. I'm not wrong, you're just inconsistent. 


#41
Dec1212, 11:17 AM

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#42
Dec1212, 11:29 AM

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#43
Dec1212, 11:30 AM

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It seems quite obvious now that Barry does not want to learn anything and is trying to push his own personal theories. Is there a way to request thread lock?



#44
Dec1212, 11:31 AM

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#45
Dec1212, 11:34 AM

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#46
Dec1212, 11:41 AM

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You need to ask yourself whether you really believe you are right and that all the replies you've been given are flawed. Could you not consider starting at the very beginning and work towards some real sense instead of jumping in half way through, getting many things the wrong way round and then demanding to be given answers that make sense to you. This is a difficult topic and needs some Rigour if you want an understanding of it. I really don't think that you can accept (or even recognise) correct answers when you see them. You need to learn the basic terms and definitions in full and not use your own interpretation of things. (The title of the thread is slightly bonkers, by the way) 


#47
Dec1212, 11:55 AM

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It's not about light or EM waves. It is about geometry of fields, about currents and wires. Do you understand? 


#49
Dec1212, 12:04 PM

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#50
Dec1212, 12:07 PM

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In fact, electromagnetic waves were predicted by Maxwell's equation before they were ever discovered. The discovery that light was a specific example of the electromagnetic waves predicted by Maxwell's equations came later. 


#51
Dec1212, 12:34 PM

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The BiotSavart Law is derived from Maxwell's Equations (Ampere's Law and Gauss' Law for Magnetism) also under the assumption of static conditions. Coulomb's Law and the BiotSavart Law are only valid when the electric and magnetic fields are not changing in time. Maxwell's Equations are more fundamental, and will describe the electric and magnetic fields under any conditions. The Lorentz Force Law will then tell you how a test particle placed in these fields will behave. 


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